Tehcron and O2 Sensors??

1990 Riviera
3.8L
155k original miles

Just wondering if Chevron's Fuel Injector Cleaner with Techron will harm the OEM or Bosch Replacement Oxygen Sensors. I've used this product for years on other vehicles with visible results. So when I saw the "E044" trouble code, checked for loose or bad vacuum hoses, and then replaced the O2 Sensor I also added a bottle to the tank due to the crappy gas we get here in the mountains. The car ran noticebly better and got better MPG for about 350 miles, and then performance/MPG seemed to drop again. I'm using the same gas supplier and driving the same routes (only one road between town and home.

Any ideas??
Thanks

techron is 1 of the best inj cleaners you can dump into the tank... i would try a run rite fuel system cleaning if you havent had one in a while

Thanks for the info. I heard the same answer back from Bosch at the same time that you wrote.

The voltage check shows around 730mV at operating temp. I'm going to pick up some new plugs, cables, and fuel system cleaner tomorrow just in case there was other damage from the sensor reporting a lean condition.

Thanks